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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32a9bf268342164952a6a42fb9d28883d3e9eb6b9fb269e8b284504dce1500f' 
  AND token = '6FuxCeRnFHbR6htvavu2444hD9WJdxPC0SBw0l9wR9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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