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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20067f6c6dd0a6c58c9a45cddac957ce1e888cb7210fea67c69e3e18e78ebf8' 
  AND token = 'lqaTHdhFdTWMTLCBUe+AkGOloxq4kKUS7KoQJUfvklw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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