SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babbbcb7fd04d133e048a1e145fd9ab1df4b3954466a840e50d3e4192fc48918' 
  AND token = 'lgzzpvYAwp7VMRonfJnHVH/EYuwVx6cXnAn7QFxTj/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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