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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e43ac78fd6c4a9488a42d79d2bad7fff777c75ff96aecdb14500e45444c23789' 
  AND token = 'mKRTjcLuD62qWMdoU0Mch6tJXyyWdJz5Of2GH36VqnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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