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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318636fb284eac2ce5fae28a6bf33de1a128ddf45b9abcdcda9b7b2bf02c2620' 
  AND token = '04sL7b8qZuStVclUZzsLevUEmwIS1CApBgbvpgJGd1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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