Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6df6d45cfb809bcf15050052e190adf7e1d09f0554290f595b2be4427da23ac' 
  AND token = 'xFdAa1qJShipvVNK/OL1nevyyBEJdhleLaAx4bB9VxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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