Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc2c997b823bfb681eedeb90e8593effdfd118bc5684ba66ae98f69abcd62c4' 
  AND token = 'jtig7X5Ay7mPFdIHiz+es9pmmBOMMVQeyxsBwo1VyFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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