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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad88161d0d0ca27b74fc8215907294b6ba5d9c84aaf37a57af30c5d220eb9ee9' 
  AND token = 'aeZePEhBTfQRUzSepaop8ykQ1AJcAgcrlh4o9hytH+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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