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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f2b09a8ba95f3fb10b1de3ee710da18215a40d4e90920e263452446e8f8b8d' 
  AND token = 'wSiMbU5rKHgffOYTmWVBYNjUQc37FpWkhgedhR0VmSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}