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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27cd00ee438e7b828738e955fbe2ca857876f297405ce9a4287d8ecb4a1a6688' 
  AND token = 'jijeWDMayxoUHl7QgMW17cgcQvDqnzK7yKwMQQ0S+0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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