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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ae5a717b50d21b44a5975256cb1d7342c7c4a7ba517aa4e3f666debe78aeb8' 
  AND token = '1xIGz+IT2LuYfn1BBwSFx7+26cNwqd0ggPR9QNNhTQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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