Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68258e212673c71dd8fbbe9c7f2e79ecbf1b171ad4cc52de9bf0f19e2e12c76e' 
  AND token = 'xCc5nekP5z4AGFCa3ARgQaJbGOYSs9nPw2+KrJAcrpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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