Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd016f5340f6e277259f82155d43f5b2c81b617f8cf6da1a13c0bb60c9f51125' 
  AND token = 'YUMl7+urXb1ZGG1YMx77huHK4InExIuMTNKrYW444kw=' 
  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"
    }
  }
}