SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab519d079368f23450e8678880cc2c073f580fd40e43fd179b50aa7be243947' 
  AND token = '+k/BGIpTsr6oJlpD5WV2pLUshbg+H1xyWEhZ51MnENo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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