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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f153a04e912bb36c8c09fcc293d039c51e0d844ad919beb27e6c4f3c41abb4b' 
  AND token = '0VX/UF16z5HZE+ANgOgb5Et6MkFBMvbQsgNutL5SX0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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