Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f3be581948f03d2f476e26aab434ad70c1158316915a39f22140a52a210181' 
  AND token = 'oZpR+J1n4amInGVvY4L+ifk6e7abgAgXVKAP7D0P5rE=' 
  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"
    }
  }
}