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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63287310e94201d5a3e5e82d14b59138be58a53b58118916ac8aad096c41582' 
  AND token = 'vyKteRrGUdX2vZtyEux8NOLygcZtopY0kSniqTUgAoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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