Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4628b76088c61cfb3243b3c8c9b6934afa2c10f064e5b833ee7ab237152597ac' 
  AND token = 'HktR9ybdhnLLGf8frOiRez4qfRyNlybyWLfgEPOjI8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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