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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635e9a54dc59fb828b5fc4269b4f50c7f8ac2364448de9cc199f16ca07894f2f' 
  AND token = 'dy1lBe1TmQuM9mw1UVecj6i64F4tWn97ina9FdFafq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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