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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2ae96564ed3e96183e93fa9782a8c734c581416de1f66e655d506420e50ec1' 
  AND token = '3wKVupF7oSf6k5U8zlr7HqUxBKQNRAtwQPS+E0uknAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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