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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17806277e21768d1af5fc8a193ad7aac4463a32faa12d21b1c701ed3b1f37101' 
  AND token = 'vH28dsuLmIYkmtIT+yd7SGFhdsF51qzZu/Izb22uE0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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