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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa4bfc79b8be695e72f897a49d50a3aa740cf7812e40d45befad6896f63fc02' 
  AND token = '2TH1l2zyUoS4O9jsCtw7d0by+8nXYsmY8VyF+FVAzEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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