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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b0bc4b1951ea27226e97eb01e088a25db9409b3d6f472c079b6c2c43ef9b14' 
  AND token = '1mi7livO8FT2TuAjIKHtbwtk7yseUaoLLAn5IQZfFUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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