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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ffac74f122c73250b9cfcd4b5fa6bd63a43a0b34cfc8dd01965984375fe198d' 
  AND token = 'u2XcYhDkvQQYrlOi9H60CwoYx6UDzuhj1+zf0LrN83A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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