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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36927c482e85d9117894c169ea22c66bff0a839969eb6ecb6b7d52c566570c2c' 
  AND token = 'b39UGGypBlNca5yIuUUsjz9RbiLu7ciCKSgg/ypWjHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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