Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d9d8108acd33e1e44aa5347ad35284210d18fdb46710e61443577f4f2bc5f7' 
  AND token = '/eeotqXAqTRvEQiE1m9RrIfqaAcJ1o1jT900bK/ds7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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