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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c59153bc153fa48020ee4f62894ea40fbf6aefc91468c4eee493c78a4437c626' 
  AND token = 'X99FnDgntBk0i1vK5gI4oYCyMoTgBsed5+TfJIPIr5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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