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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23b68dba3bbd965af884308082233966210c94f1e16ed182dae826b1a58b7c1' 
  AND token = 'Zh8ZioGx42PkSnh4sWEnaitXyyni1FWq6btkm0cgDL8=' 
  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"
    }
  }
}