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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aab485a48954fabfc6fe3742a243be91ffca58cacdb8c857487c4c387a554ec' 
  AND token = '7k9y84eghG7t+Tdb69mJ6hxm3oQnTWvwu872z/v5rq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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