SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e47cf6c3229a6a9c3f461ea05fb9da4a92ad661ed10ffd1d65c3677343d280' 
  AND token = 'P3xEzjzyVdVhsKYyHGvDVQPvhtwLbrvuFN6HT1fpzgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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