Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0346fa2707990f9d6684221cf58f5a538f50dc59d20c6758ee54f12a6297274' 
  AND token = 'pg3jdWS8wuIFmqSBzYzMNtHaSTVDr0XMkBA7OSoN2cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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