Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11bd9c3ee6d4acfb3ecc4d7c776db9b54f78ee3f786df8b7281aa508485c5e86' 
  AND token = '0U6qZVfGvHmUtxt7s2p2H5amN8lt+3KEgsQ0jaNf/ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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