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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca28720c3cf5e3a10cf8dc101f93375280f38c1e1dd010dd4a1cb792085c6a0' 
  AND token = 'UE7Y/Meojsx6zqqotefOdjZMlRWiq8y5W/Gm6hW4MLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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