Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a8cf9f1505cfb8d77b8814585ef2f7f9311fb4ac146f4a16853bb7d62b3820' 
  AND token = '8ALJos1fv4/biS4fCFNUOViGUGYj/abUBMEz/KJNd9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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