Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e084181c436ede7b9b1bfec9457a1ad5a8ae0790c965d94944a2cc010ada38' 
  AND token = 'gysELUK79fc3eYQhz67EqY99iLkiRlpj/txajwJ4NPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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