SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29195a6452f550cc8a813ae1d14d07168d123668002dbcfefadd1a24ea28131d' 
  AND token = 'vl+/hoj4wCs8O4tYmxBiuvd+KVBoySqs1sAusJWO7bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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