Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68aa042042e17747a6a5a317f39a734ed7c365a91e4bb6c51b08202cfb5f6863' 
  AND token = 'zm0A82cXC6FpivbtKH6hcc9SSOGnclk4fYwYetWfo8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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