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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5334a45378a488d6bfc3c8d8ff985ed936ee7cfa37baaabf7bacf63b293900c4' 
  AND token = 'GeLHQEiolLF1xdf0CJQRxdjYi0YJi3o7b3xV/hwI/uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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