Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd817d0f57b8ec084826f5250d09391ff7f99797fc3ffcca4fa935560716c09a5' 
  AND token = 'x0fVdB2e0Q4EEhNLB36wMJA9g0xeJWNG+Pm67wtVYJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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