SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ea9638cf56ef25ba1de2c0fbc914c858972d6a57c87b1c5258bd5b6395784e' 
  AND token = '1VTdBRkXo2xzhCnm/mxxjGg8zI/dLn4gMwaFO+7bino=' 
  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"
    }
  }
}