SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af29432b77fd272146c222a72510a215f7e3c0c521b1f85d85b6888f5ad6af8' 
  AND token = 'JTEx+81mTTFAPRZuV/sv4c962G62abHS0B3nwqDmpzQ=' 
  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"
    }
  }
}