Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ff6e5432d5ab1dedbd3d25604b4515d90fc7b8cded261757e055bd9caae06d' 
  AND token = 'CrRoykZbQd4SEuN4DbwMslk3jp2PlL4pdGLs+QK/MMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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