Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a388506f2281f61577a3bde5d1d079bb111e515af3e7bad4878c8d45528bcb52' 
  AND token = 'CGcsSN3HKTuQbNfvkH2N0PobXRo21Se1J7SJaIdTQB8=' 
  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"
    }
  }
}