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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '378f9b3cfa539d3a90fb9f8993e611a885ea29fb2d0f41fed12b798d9e80ebe8' 
  AND token = 'alfbxLcgR5HtZXD5fEi1Rte0RHndjIHfH/zLNAjn6gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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