Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c35bba3fcc91f9df7e2bccdeb4a7103276032e97ac8b0d50609f76cdfb8b751' 
  AND token = '5RKmKO+ZdP92Hzae3NkINCE8HRyS1nuarIORMARj3lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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