SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb5535a40a8666da52a09ac3422efbeb4509e14cbbbcd9bf4e43859f047f65a' 
  AND token = 'i33qFwKTlrPdWW6UYcmCmijXgwdYpgoWVshK7qDnzyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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