Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9142f0ca17ab93d23ace2b99586f585aae5ce0e064031692e276d1d82f9d8c64' 
  AND token = '1xKcNtXsvuZjaqSU8A5CRpk4i2XH+UNQGHDwIfNcpno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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