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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9515d5d622e35993145581b69a6cc1afc3a99d715eb31d119f0c35ab6a441bf' 
  AND token = 'UMVOFMDj5DxNj3D8iwhd9yu8vWbDxnSHqdEWu68f9b8=' 
  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"
    }
  }
}