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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eaeb33196a9ea77b62131edae774f1c4ad4e9235b53b03d5d619719ee347e46' 
  AND token = '8hKVsZSn0cVqOCJdsIZqa2nFXuDpSBAWrzAqM66w/xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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