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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97bdeebe3aa0ee7175050b9798a5a906055fe31f959308ab49c38e7c28c99d0' 
  AND token = 'ZPWWNea5SzgwkzmHD8ZftqKHbfszxDNNTTT+7e8DfTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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