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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30db4d741166fb30b5f657f9fa9f2f0c314c31b7341bf52ae3035b09ce1391c5' 
  AND token = '2BR762XliQWwrZe2XUduIErvFalGVFMNPYyd/R24FFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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