Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0668ff5e418c4ca98cc7e4605c7e0ae1fc6d56efc67d4446171238492a33a1cf' 
  AND token = 'MxayH5UZeb+aDbmUkOKK4rvigv2bNI1jJTLJK0z9hwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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