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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0ca9db2a7de66ca3450235346a28a1a97a19e7197b53731b3c21e1f8072428' 
  AND token = '3VQ59d/4P744xhZRqviUsZN8oSaZYWu+uVEBoUqkn+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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