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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c123f8b76983f1726be6cc5fd2bf6e02c3d86d8e76ecf8c47a5ea37fa3eb52' 
  AND token = 'xWVRypEwuKuepuG2uKZQ6ba7s6brkVbrIvsYUTBIH4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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