Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0370e0ea17c125b2338e102ca1ab528951f80326ad2cf71af9f50c8fc3ad660b' 
  AND token = 'iAmTeUDks8qZjIgnXTRqbXcaIbpAqaPpXWXyVTR8rJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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