SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '528e389b60fecf31326d4afb5d9083ea7356290ce20cb927f2a7444706130686' 
  AND token = 'wLsRYn5RZIROz+w6Rj1K2DqF8M6T/NXzb1V34AewZqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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