Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a87b8c41fbe8edbe4b420cbfbd487a7eeddf763b82a27879583eb9cb0079352' 
  AND token = '1Wh5uXYyFokFN1s5qBxNUwm2g+n46UwqzLXszoCSmZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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