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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edba7d1221aa8547feaa6b5c27f32cadbe6ada35a7519ab9cee98dc22bec3ad6' 
  AND token = 'K8Zl5VM0jqXLhsWQ+4anRmOYD0DRrjN+2vf3vccpY4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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