Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce5ee9ce9e36593d71aa8a20fac2afa21e062709d4c76766bf5d6d6c8271dcf' 
  AND token = 'kgQqXDqfjLa4QnzpLQnRR89+460U469C0ozfRi+TOwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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