Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117c41b4208f03fedcce95d2c4fbe1540e20dbe8b841c6b3ab36428ce65a7aa2' 
  AND token = 'mM4BnELwAK5FpPG6hO1MXlMhqJDNaE9epRMaVQPPHxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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