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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7af3df1cc59a761b640da6d1cc340657512834014fa16648e3b00025a6255b9' 
  AND token = '9q9afIAqhf38jX9jqGr7YhNliAaopLO7aEwOJn//Fgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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