SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65f8cae138fa0a5f5d47eb551dd7d360a479c68ece997bede373219db72435a7' 
  AND token = 'qFbGYn7c/OJoojTd2GW5B7v1lC+pVydC1gKdALiZv80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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