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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03df19eb398cccd5a078c56d9ceded48cfb478803f3d62154713f039aecd2766' 
  AND token = 'Ejs0rmSmIn469C50W76yZdH7EmEQRc0MSczlqgiZNUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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